JP4308237B2 - Exchange apparatus, communication system, and communication control method - Google Patents

Description

  The present invention relates to an exchange device, a communication system, and a communication control method, and more particularly to an exchange device that controls transmission of a connection signal to a destination terminal device that can be connected by a plurality of types of networks, a communication system using the same, and a communication control method About.

  2. Description of the Related Art A terminal device having a communication function using a wireless LAN (hereinafter abbreviated as WLAN) and a communication function using a mobile phone network that is a mobile communication system compliant with IMT (International Mobile Telecommunication) -2000 is known. Considering that such a terminal device is a receiving side and receiving a call is possible on a plurality of communication networks, the destination communication network is determined based on the status of the terminal device being located.

Here, it is difficult for the location information management server to update the location information in real time. That is, updating the location information in real time imposes a heavy load on the communication network, which is not realistic. Although pre-paging processing can be considered, in that case, the burden on the user side becomes large.
By the way, a technique for performing routing when a PHS (Personal Handyphone System) mobile device moves from a public service area to a self-service service area is known (for example, see Patent Document 1).
JP 2000-358280 A

  If the location information cannot be updated in real time, an unmatch between the actual user location status and the location information managed by the location information management server may occur. That is, even if it is recognized that the terminal device on the receiving side is in the service area and the incoming call processing is performed, there may be cases where the call cannot be received because it is actually out of the service area. In this case, there is a problem that if the incoming call arrives at another communication network and the call connection is possible, the incoming call opportunity is lost. Such a problem cannot be solved by the routing technique described in Patent Document 1.

  The present invention has been made to solve the above-described problems of the prior art, and its purpose is when an unmatch between an actual user's location status and location information managed by the location information management server occurs. However, it is to provide a switching apparatus that can realize an incoming call, a communication system using the same, and a communication control method.

According to a first aspect of the present invention, there is provided a switching apparatus according to a first aspect of the present invention, wherein, for a destination terminal device, area information acquisition means for acquiring area information in a plurality of types of networks and contents of area information acquired by the area information acquisition means And a connection request transmitting means for transmitting a connection request to the destination exchange apparatus together with a rerouting flag indicating that connection by these networks is possible when there are a plurality of types of networks, and the destination exchange apparatus If the connection Call response is returned from the destination exchange devices belonging to different networks from the network that belongs the destination switching apparatus, viewed contains a rerouting means for transmitting a connection request, the connection in the destination changer When the rerouting flag is not received and the rerouting flag is received, activation of an additional service such as an answering machine service is suppressed . By performing the rerouting in this way, it is possible to realize an incoming call even when an unmatched state between the actual user's location state and the location information managed by the location information management server occurs.

The switching apparatus according to claim 2 of the present invention provides a rerouting flag indicating that, when the contents of the area information acquired for the destination terminal apparatus are areas for a plurality of types of networks, connection by those networks is possible. And a connection request receiving means for receiving a connection request, an additional service activation suppressing means for suppressing activation of an additional service such as an answering machine service when connection to the destination terminal device is impossible, and the destination Ri connection impossible der to the terminal device, and, wherein when having received the re routing flag, toward the source of the connection request, the destination Inaccessible indicating that is impossible to connect to the terminal apparatus Rerouting instruction means for sending back a response and instructing rerouting of the connection request. In this way, by performing the rerouting while suppressing the activation of the additional service, it is possible to realize an incoming call even when an unmatched state between the actual user's location state and the location information managed by the location information management server occurs.

According to a third aspect of the present invention, there is provided a communication system according to a third aspect of the present invention, for a destination terminal device, area information acquisition means for acquiring area information in a plurality of types of networks; And a connection request transmitting means for transmitting a connection request to the destination exchange apparatus together with a rerouting flag indicating that connection by these networks is possible when there are a plurality of types of networks, and the destination exchange apparatus When a connection failure response is returned from the first switching device (for example, described later), including a rerouting means for transmitting a connection request to a destination switching device belonging to a network different from the network to which the destination switching device belongs. Corresponding to the SIP server 21 in FIG. 1),
Connection request reception for receiving a connection request together with a rerouting flag indicating that connection by these networks is possible when the contents of the area information acquired for the destination terminal device are areas for a plurality of types of networks means, Ri connection impossible der to the destination terminal device, and, wherein when having received the re routing flag, and inhibit additional service activation suppressing means the activation of supplementary services, such as Voice Mail service, the incoming When connection to the destination terminal device is impossible, a connection failure response indicating that connection to the destination terminal device is not possible is returned to the connection request transmission source to reroute the connection request. A second switching apparatus (for example, corresponding to the SIP server 22 in FIG. 1 described later) including a rerouting instruction means for instructing
It is provided with. In this way, by performing the rerouting while suppressing the activation of the additional service, it is possible to realize an incoming call even when an unmatched state between the actual user's location state and the location information managed by the location information management server occurs.

The communication control method according to claim 4 of the present invention corresponds to a location information acquisition step (for example, steps S12 to S15 in FIG. 2 described later) for acquiring location information in a plurality of types of networks for the destination terminal device. ), And when the contents of the location information acquired in the location information acquisition step are locations for a plurality of types of networks, together with a rerouting flag indicating that connection by these networks is possible, the destination switching device A connection request transmission step (for example, corresponding to step S17 in FIG. 4 to be described later, step S22 in FIG. 5 to be described later) and connection to the destination terminal device are impossible. Additional service activation suppression step for suppressing activation of additional services such as services (for example, corresponding to step S18 in FIG. 4 and step S22a in FIG. 5 described later) , Ri connection impossible der to the destination terminal device, and, when receiving the re routing flag, toward the source of the connection request, it connects to the destination terminal device is impossible And a rerouting instruction step (for example, corresponding to step S20 in FIG. 4 and step S22d in FIG. 5 described later) for instructing rerouting of the connection request. In this way, by performing the rerouting while suppressing the activation of the additional service, it is possible to realize an incoming call even when an unmatched state between the actual user's location state and the location information managed by the location information management server occurs.

  According to the present invention, when connection to the destination terminal device is impossible, activation of an additional service such as an answering machine service is suppressed, a connection impossible response is returned to the connection request transmission source, and the connection is established. By instructing the request rerouting, there is an effect that an incoming call can be realized even when an unmatched state between the actual user's location state and the location information managed by the location information management server occurs.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings referred to in the following description, the same parts as those in the other drawings are denoted by the same reference numerals.
(System configuration)
FIG. 1 is a block diagram illustrating a configuration example of a communication system in which an exchange apparatus according to an embodiment of the present invention is employed. In the figure, the receiving terminal device 2 has a function capable of receiving an incoming call for each of a WLAN call and a mobile phone network.

  When a connection signal is transmitted from the WLAN originating side terminal device 1, the originating side SIP (Session Initiation Protocol) server 21 receives it (step S11). The SIP server 21 inquires of the WLAN location information management server 31 about the location information about the called terminal device 2 (step S12). The area information management server 31 that has received this area information inquiry makes an area information inquiry to the area information management server 32 for the mobile phone network to acquire the area information (step S13a). At the same time, the area information management server 31 makes an area information inquiry to the area information management server 33 for another communication network, and acquires area information (step S13b). In this example, it is assumed that the location information “located” in the mobile phone network and “non-located” in another communication network are acquired.

  The area information management server 31 that has acquired the area information determines a transfer destination domain based on the acquired area information (step S14). In this example, the transfer destination domain is determined as “WLAN”. Thereafter, the located area information management server 31 notifies the SIP server 21 of the determined transfer destination domain (step S15). In the case of notification of this transfer destination domain, if another in-zone communication network exists, it is notified to the SIP server 21 as reroutable information. In this example, in addition to the destination domain “WLAN”, the rerouting “mobile phone network” (first priority) and the rerouting “XXXX network” (second priority) are notified to the SIP server 21. Further, in this example, the “mobile phone network” is notified to the SIP server 21 as information relating to the communication network that provides the additional service.

  The SIP server 21 that has received the notification of the transfer destination domain stores and holds the rerouting information (step S16). Thereafter, the SIP server 21 transmits a connection request signal to the SIP server 22 (step S17). This connection request signal includes a reroutable flag. The SIP server 22 that has received this connection request signal recognizes that the additional service is not activated even if the terminating terminal device 2 is out of service area when the reroutable flag is included (step S18). The SIP server 22 transmits a connection request signal to the receiving terminal device 2 in the WLAN (step S19).

  In this example, it is assumed that the receiving terminal device 2 is actually out of range. In this case, an additional service such as an answering machine service is originally activated. However, as described above, the connection signal received by the SIP server 22 from the SIP server 21 includes a reroutable flag, so that the additional service is not activated. Then, the SIP server 22 notifies the SIP server 21 of the caller side communication network of being out of service area and a rerouting instruction (step S20).

The SIP server 21 that has received the notification that it is out of service area and the rerouting instruction performs the rerouting process to the rerouting destination of the first priority, that is, the “mobile phone network” (step S21). In this example, a rerouting process is performed via an MSC (Mobile Services Switching Center) 23 of the mobile phone network (step S22). In this example, since the receiving terminal device 2 is in the area, a telephone call or the like is subsequently performed. If all the connection destinations are out of service area, the user of the receiving terminal device 2 activates the additional service in the communication network in which the additional service is to be activated (step S23).
In short, in this communication system, the rerouting process is performed when the incoming call processing is performed after determining the destination network. In the rerouting process, additional services are suppressed according to the presence or absence of a flag or the like.

(Processing sequence)
Next, the above process will be described with reference to a sequence diagram and the like. 2 and 4 to 6 are sequence diagrams showing signal exchange between the devices in FIG. In these drawings, the originating side terminal device 1, the originating side SIP server 21, the in-zone information management server 31, the in-zone information management server 32, the in-zone information management server 33, the terminating side SIP server 22, the MSC 23, and A signal and the like exchanged between the receiving terminal device 2 are shown.

  In FIG. 2, a connection request signal is transmitted from the calling terminal device 1 to the SIP server 21 (step S11). The SIP server 21 that has received this connection request signal makes an inquiry about the location information of the called terminal device 2 to the WLAN location information management server 31 (step S12). The area information management server 31 that has received this area information inquiry confirms the contract status (step S12a). Here, it is confirmed that a contract for a mobile phone network and a contract for another communication network are made.

  For this reason, the location information management server 31 transmits a location information inquiry to the location information management server 32 for the mobile phone network (step S13a), and acquires a location information confirmation response as a response (step S13a ′). ). At the same time, the area information management server 31 transmits an area information inquiry to the area information management server 33 for another communication network (step S13b), and acquires the area information confirmation response as a response (step S13b). '). In this example, it is assumed that the location information “located” in the mobile phone network and “non-located” in another communication network are acquired.

  The area information management server 31 that has acquired the area information determines a transfer destination domain (that is, a destination domain) based on the acquired area information (step S14). In this case, the priority destination network and whether or not rerouting is possible are determined, and the network that activates the priority supplementary service is determined. For example, as shown in FIG. 3, for the priority destination network, user setting values are set in the order of “WLAN”, “mobile phone network”, “other communication network”, “reroutable”, “WLAN” is set as the additional service activation network.

Returning to FIG. 2, the location information management server 31 notifies the location information confirmation response (step S15) in order to notify the destination network (step S14a). In this case, it is notified that the destination domain is “WLAN” and the first priority of rerouting is “mobile phone network”. The other networks mentioned above are out of service area and are not subject to rerouting. Further, it is notified that the additional service activation is performed on the mobile phone network.
The SIP server 21 that has received these holds the connection request signal routing to the destination network, the rerouting destination network information, and the additional service activation network information (step S16).

  Here, for example, the following information is held. That is, when rerouting is held and when rerouting is performed, rerouting priority information (for example, first priority = mobile phone network, second priority = WLAN) is held, additional service activation network (= mobile phone network) Hold. The “additional service activation network” refers to a setting for starting the additional service in the network where the additional service is to be activated when the incoming call cannot be received in any network after rerouting.

Next, the process proceeds to FIG. 4, and the SIP server 21 transmits a connection request signal to the SIP server 22 (step S <b> 17). This connection request signal includes a reroutable flag. In addition, information that the additional service activation network is “present” is included.
When rerouting is not possible, it is desirable that the reroutable flag itself is not included. That is, the reroutable flag can be realized, for example, by setting a specific part in the packet of the connection signal to “0” or “1”. When the reroutable flag is not included, the existing incoming call processing is started (that is, rerouting is not performed). Considering this, it is desirable that this flag itself is not included when rerouting is not performed.

The SIP server 22 that has received this connection request signal recognizes that the additional service is not activated even if the terminating terminal device 2 is out of service area when the reroutable flag is included (step S18). The SIP server 22 transmits a connection request signal to the receiving terminal device 2 in the WLAN (step S19).
In this example, it is assumed that the receiving terminal device 2 is actually out of range. For this reason, the incoming call to the receiving terminal device 2 becomes impossible (step S19a). Here, since the connection request signal received by the SIP server 22 from the SIP server 21 includes a reroutable flag, the SIP server 22 notifies the SIP server of the originating communication network that it is out of service area and the rerouting instruction. 21 is notified (step S20).

  Receiving this notification, the SIP server 21 performs the rerouting process to the rerouting destination of the first priority, that is, the “mobile phone network” (step S21). At this time, if a network for starting the additional service is designated, a reroutable flag is set. On the other hand, when the network for starting the additional service is not set, or when the network for starting the additional service is not specified in the mobile phone network and there is no reroutable network, the reroutable flag is not set.

  Here, when the additional service activation network is designated, the processing shifts to FIG. In the figure, the SIP server 21 transmits a connection request signal to the MSC 23 (step S22). If the reroutable flag is set as reroutable, the MSC 23 recognizes that the additional service is not activated (step S22a). Then, if a connection request signal is transmitted from the MSC 23 and the receiving terminal device 2 is in the service area, then a call or the like is performed.

  On the other hand, even if the connection request signal is transmitted, if the receiving terminal device 2 is out of the service area, the incoming call cannot be made (steps S22b and S22c). In this case, the MSC 23 transmits an out-of-service notification to the SIP server 21 (step S22d). The SIP server 21 that has received this notification transmits a connection request signal in order to activate the additional service in the designated network (steps S23 and S23a). In this example, an additional service is activated in the SIP server 22 (step S23b).

On the other hand, if the additional service activation network is not designated, the process proceeds to FIG. In the figure, the SIP server 21 transmits a connection request signal to the MSC 23 (step S22). Here, since the reroutable flag is not set, a connection request signal is transmitted from the MSC 23, and if the receiving terminal device 2 is in the area, then a call or the like is performed.
On the other hand, even if the connection request signal is transmitted, if the receiving terminal device 2 is out of service area, the incoming call cannot be made (steps S22b and S22c). In this case, the additional service is activated in the MSC 23 (step S23b).
In the above description, the case where the calling side network is a WLAN has been described. However, the present invention is not limited to this case, and the present invention can be applied even when the calling side network is a mobile phone network or another network. .

(SIP server)
The SIP server configuring the communication system described above can be configured using a general server device. The SIP server 21 has the following functions. That is, as shown in FIG. 7, for the destination terminal device, the area information acquisition unit 211 for acquiring area information in a plurality of types of networks, and the area area acquired by the area information acquisition unit 211. When the content of the information is located in a plurality of types of networks, the connection request transmitting means 212 for transmitting a connection request to the destination exchange apparatus together with a rerouting flag indicating that connection by these networks is possible, And a rerouting means 213 for transmitting a connection request to a destination switching apparatus belonging to a network different from the network to which the destination switching apparatus belongs when a connection impossible response is returned from the destination switching apparatus. .

On the other hand, the SIP server 22 has the following functions. That is, as shown in FIG. 8, when the contents of the area information acquired for the destination terminal device are areas for a plurality of types of networks, the rerouting indicating that connection by these networks is possible with a flag, a connection request receiving unit 221 for receiving the connection request, Ri connection impossible der to said destination terminal device, and, when receiving the re routing flag, initiation of a supplementary service, such as Voice Mail service The connection to the destination terminal device is impossible for the connection request transmission source when the connection to the additional service activation suppression unit 222 for suppressing the connection and the destination terminal device is impossible. And a rerouting instruction means 223 for sending back a connection impossible response and instructing the rerouting of the connection request.
By configuring the communication system using the SIP servers 21 and 22 as described above and performing rerouting while suppressing the activation of the additional service, the actual state of the user and the area managed by the area information management server An incoming call can be realized even when an unmatch with information occurs.

(Communication control method)
In the communication system described above, the following communication control method is realized. That is, for the destination terminal device, the location information acquisition step (for example, corresponding to steps S12 to S15 in FIG. 2) for acquiring location information in a plurality of types of networks and the location information acquisition step When the content of the location information is for a plurality of types of networks, a connection request transmission step for transmitting a connection request to the destination switching device together with a rerouting flag indicating that connection by these networks is possible (for example, 4 corresponds to step S17 in FIG. 4 and step S22 in FIG. 5), and additional service activation suppression that suppresses activation of additional services such as an answering machine service when connection to the destination terminal device is impossible step (e.g., step S18 in FIG. 4, corresponding to the step S22a in FIG. 5) and, Ri connection impossible der to the destination terminal device, and, prior to When receiving the re routing flag, toward the source of the connection request, and returns a connection Call response indicating that the connection to the called terminal device is impossible, instructs the rerouting of the connection request rerouting A communication control method including an instruction step (for example, corresponding to step S20 in FIG. 4 and step S22d in FIG. 5) is realized.
In this way, by performing the rerouting while suppressing the activation of the additional service, it is possible to realize an incoming call even when an unmatched state between the actual user's location state and the location information managed by the location information management server occurs.

  The present invention can be used to control transmission of a connection signal to a destination terminal device that can be connected by a plurality of types of networks.

It is a block diagram which shows the structural example of the communication system using the switching apparatus which concerns on embodiment of this invention. FIG. 2 is a sequence diagram showing signal exchange between devices in FIG. 1. It is a figure which shows the determination content about a priority call destination network, the rerouting possibility, and the network which starts a priority addition service. FIG. 2 is a sequence diagram showing signal exchange between devices in FIG. 1. FIG. 2 is a sequence diagram showing signal exchange between devices in FIG. 1. FIG. 2 is a sequence diagram showing signal exchange between devices in FIG. 1. It is a block diagram which shows the structural example of the SIP server 21 in FIG. It is a block diagram which shows the structural example of the SIP server 22 in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Originating side terminal device 2 Incoming side terminal device 21, 22 SIP server 31, 32, 33 Visited area information management server 211 Visited area information acquisition means 212 Connection request transmission means 213 Rerouting means 221 Connection request receiving means 222 Additional service activation suppression means 223 Rerouting instruction means

Claims (4)

With respect to the destination terminal device, the area information acquisition means for acquiring area information in a plurality of types of networks, and the contents of the area information acquired by the area information acquisition means are in areas for a plurality of types of networks A connection request transmitting means for transmitting a connection request to the destination exchange apparatus together with a rerouting flag indicating that the connection by the network is possible, and when a connection impossible response is returned from the destination exchange apparatus, to the destination exchange devices belonging to different networks from the network that belongs destination changer, viewed contains a rerouting means for transmitting a connection request, the connection has received it and the re-routing flag impossible in the destination changer In this case, the switching apparatus is characterized in that activation of an additional service such as an answering machine service is suppressed . Connection request receiving means for receiving a connection request together with a rerouting flag indicating that connection by these networks is possible when the contents of the area information acquired for the destination terminal device are areas of a plurality of types of networks If, Ri connection impossible der to the destination terminal device, and, when receiving the re routing flag, and inhibit additional service activation suppressing means the activation of supplementary services, such as Voice Mail service, the destination When connection to the terminal device is impossible, a connection failure response indicating that connection to the destination terminal device is not possible is returned to the connection request transmission source, and the connection request is rerouted. An exchange apparatus comprising: a rerouting instruction means for instructing. With respect to the destination terminal device, the area information acquisition means for acquiring area information in a plurality of types of networks, and the contents of the area information acquired by the area information acquisition means are in areas for a plurality of types of networks A connection request transmitting means for transmitting a connection request to the destination exchange apparatus together with a rerouting flag indicating that the connection by the network is possible, and when a connection impossible response is returned from the destination exchange apparatus, A first switching device including rerouting means for transmitting a connection request to a destination switching device belonging to a network different from the network to which the destination switching device belongs;
Connection request reception for receiving a connection request together with a rerouting flag indicating that connection by these networks is possible when the contents of the area information acquired for the destination terminal device are areas for a plurality of types of networks means, Ri connection impossible der to the destination terminal device, and, wherein when having received the re routing flag, and inhibit additional service activation suppressing means the activation of supplementary services, such as Voice Mail service, the incoming When connection to the destination terminal device is impossible, a connection failure response indicating that connection to the destination terminal device is not possible is returned to the connection request transmission source to reroute the connection request. A second exchange apparatus including a rerouting instruction means for instructing
A communication system comprising: For the destination terminal device, a location information acquisition step for acquiring location information in a plurality of types of networks, and a case where the contents of the location information acquired in the location information acquisition step are for a plurality of types of networks , together with the re-routing flag indicating that it is possible to connect by their network, a connection request transmission step of transmitting a connection request to the destination exchange device, Ri connection impossible der to the destination terminal device, and, An additional service activation suppression step for suppressing activation of an additional service such as an answering machine service when the rerouting flag is received, and a connection source of the connection request when connection to the destination terminal device is impossible A rerouting indicator that returns a connection disabling response indicating that connection to the destination terminal device is impossible, and instructs rerouting of the connection request. Communication control method which comprises the steps.

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